Get parts of a matrix

mat = Table[Subscript[m, i, j], {i, 5}, {j, 5}]

{{Subscript[m, 1, 1], Subscript[m, 1, 2], Subscript[m, 1, 3], Subscript[m, 1, 4], Subscript[m, 1, 5]}, {Subscript[m, 2, 1], Subscript[m, 2, 2], Subscript[m, 2, 3], Subscript[m, 2, 4], Subscript[m, 2, 5]}, {Subscript[m, 3, 1], Subscript[m, 3, 2], Subscript[m, 3, 3], Subscript[m, 3, 4], Subscript[m, 3, 5]}, {Subscript[m, 4, 1], Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4], Subscript[m, 4, 5]}, {Subscript[m, 5, 1], Subscript[m, 5, 2], Subscript[m, 5, 3], Subscript[m, 5, 4], Subscript[m, 5, 5]}}

MatrixForm[mat]

MatrixForm[{{Subscript[m, 1, 1], Subscript[m, 1, 2], Subscript[m, 1, 3], Subscript[m, 1, 4], Subscript[m, 1, 5]}, {Subscript[m, 2, 1], Subscript[m, 2, 2], Subscript[m, 2, 3], Subscript[m, 2, 4], Subscript[m, 2, 5]}, {Subscript[m, 3, 1], Subscript[m, 3, 2], Subscript[m, 3, 3], Subscript[m, 3, 4], Subscript[m, 3, 5]}, {Subscript[m, 4, 1], Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4], Subscript[m, 4, 5]}, {Subscript[m, 5, 1], Subscript[m, 5, 2], Subscript[m, 5, 3], Subscript[m, 5, 4], Subscript[m, 5, 5]}}]

Part[mat, 1, 2]

Subscript[m, 1, 2]

mat[[4]]

{Subscript[m, 4, 1], Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4], Subscript[m, 4, 5]}

mat[[All, 4]]

{Subscript[m, 1, 4], Subscript[m, 2, 4], Subscript[m, 3, 4], Subscript[m, 4, 4], Subscript[m, 5, 4]}

mat[[1 ;; 2, 1 ;; 3]]//MatrixForm

MatrixForm[{{Subscript[m, 1, 1], Subscript[m, 1, 2], Subscript[m, 1, 3]}, {Subscript[m, 2, 1], Subscript[m, 2, 2], Subscript[m, 2, 3]}}]

mat[[2 ;; -2, 2 ;; -2]]//MatrixForm

MatrixForm[{{Subscript[m, 2, 2], Subscript[m, 2, 3], Subscript[m, 2, 4]}, {Subscript[m, 3, 2], Subscript[m, 3, 3], Subscript[m, 3, 4]}, {Subscript[m, 4, 2], Subscript[m, 4, 3], Subscript[m, 4, 4]}}]